package com.android.oobe;import android.app.Activity;import android.os.Bundle;import androidx.annotation.Nullable;import com.android.oobe.application.AppOptionFragment;public class DefaultActivity extends Activity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout_default);        AppOptionFragment appOptionFragment = new AppOptionFragment();        getFragmentManager().beginTransaction().replace(R.id.frameLayout, appOptionFragment).commit();    }}